thanks for your quick reply. The 2 expansion ports to be programmed, is my interest. I want to transfere my old programm that is atm using the CIA parallel ports from old Amiga boards. 8 bit plus 2 bits to control the bus. So, total 10 bits would be required to be programmed by directly hardware access (special hardware been developed). Then all would run on the V4 only, so that I would not need an old unstabe big amiga anymore.
If expansion port drivers are existing then I would use those to check if the 2 ports are in use (blocked?). And if not, I would block those in the system via the drivers.
Then I would like to take those over and do direct programming on those out of an interrupt via move.b and bset.
When my program quits, those ports are handed over back to the OS. Good old direct ugly Amiga style.
ATM I have not bought anything from Apollo yet. But will start purchasing first ones this year as presents for friends.
The main reason not making the transfer yet, is atm, that I have privately too less time. And that other things I have to finsh first, as other wise my wife kills me. As I am following since 2018 I am highly interested in this project - keeping Amiga alive - and - as well - my development - I spend many years and many money on it. All made with MaxomASM - which is still working.
So, I am glad to have you all and do really appriciate keeping Amiga alive. Progamming Amiga was so cool. ATMEL, I do also in risc but is not that funny as Amiga.